Day, a 21-year-old Australian who has shared the lead after all three rounds, turned in a 70 Saturday.
Bradley and Day were at 12-under 204 with a four-stroke lead over eight players.
Brett Quigley, winless in 341 career PGA Tour starts, shot a 69 to lead the pack at eight-under 208. Quigley was joined by Jay Williamson (67), Greg Chalmers (70), Omar Uresti (70), Kent Jones (70), Cliff Kresge (72), Bart Bryant (73) and Bryce Molder (72).
Celebrity Couples of 2014 [PHOTOS]